KYIV, Ukraine — The Ukrainian government has taken the main cathedral of the revered historic monastery from the church previously affiliated with Moscow’s patriarchate and allowed its Ukrainian rival to use it for Orthodox Christmas services. On Friday, Tkachenko said that the Orthodox Church of Ukraine (OCU) — the similarly named rival church — asked for and was granted permission to conduct the service at the cathedral on Saturday when Orthodox Christmas is celebrated. The Ukrainian Orthodox Church (UOC), which remained loyal to the Moscow patriarch since the 17th century, declared independence from Moscow’s Patriarchate after Russia’s invasion of Ukraine.